Preheat a gas grill to high or build a fire in a kettle grill (or use an existing fire).

Cut pepper in half and remove seeds and core. Place pepper on the grill until charred on all sides, turning as needed — about 10 to 12 minutes. Place pepper in a sealed plastic bag until cool; then remove skin with fingers.

In a blender or food processor, puree pepper, garlic, yogurt, mayonnaise, and white pepper. Add salt if desired. Refrigerate for later use or serve at room temperature. Makes 1 cup.

NOTES : Use this dip for a tray of raw or grilled vegetables, or spread it on crackers or French bread.